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Título:
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Correlation technique for the compensation of diffraction widening of optical reference signals
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Autores:
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Saez Landete, José ;
Alonso Fernández, José ;
Sánchez Brea, Luis Miguel ;
Morlanes Calvo, Tomás ;
Bernabeu Martínez, Eusebio
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Tipo de documento:
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texto impreso
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Editorial:
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Optical Society of America, 2009-09-01
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Optica
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Tipo = Artículo
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Resumen:
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Two-grating measurement systems are routinely employed for high-resolution measurements of angular and linear displacement. Usually, these systems incorporate zero reference codes (ZRCs) to obtain a zero reference signal (ZRS), which is used as a stage-homing signal. This signal provides absolute information of the position to the otherwise relative information provided by the two-grating incremental subsystems. A zero reference signal is commonly obtained illuminating the superposition of two identical pseudorandom codes and registering the transmitted light by means of a photodiode. To increase the resolution of the system, a reduction of the grating period and the ZRC widths is required. Due to this reduction, the diffractive effects produce a widening of the ZRS and, in turn, a loss of the measuring accuracy. In this work, we propose a method to narrow the distorted signal obtained with a Lau-based encoder, reinstating the accuracy of the ZRS. The method consists of the inclusion of a correlation mask on the detector. A theoretical model to design the mask has been developed, and experimental results have been obtained that validate the proposed technique.
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En línea:
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https://eprints.ucm.es/id/eprint/26222/1/Bernabeu%2CE23libre.pdf
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